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Yn y mynegeion y mae'r termau sy'n perthyn i ddisgrifiadau byw wedi'u tanlinellu.
A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z|Eraill/Other
M. C. Llewellin and Company, Solicitors USE Llewellin, M. C., & Co., Solicitors (active 1968 | Usk (Wales) | solicitors)
M.Y.M. USE Mudiad Ysgolion Meithrin (Formed 1971 | Wales | Nursery education)
Mabelfyw Manor (Wales) (manor)
Mabelview Manor (Wales) USE Mabelfyw Manor (Wales) (manor)
Mabudrud Manor (Wales) (manor)
Machen & Waunfawr (Wales). School Board USE Machen & Waunfawr School Board (Active 1880-1904 | Machen & Waunfawr (Wales) | educational administration)
Machynlleth (Wales) | Poor Law Union |1 USE Machynlleth Poor Law Union (1839-1930 | Machynlleth (Wales) | welfare administration)
Machynlleth (Wales) | Rural District Council (1895-1974 | Machynlleth (Wales) | local government)
Machynlleth (Wales) | Urban District Council (1895-1974 | Machynlleth (Wales) | local government)
Machynlleth and District Civic Society (1979-1993 | Machynlleth (Wales) | society)
Machynlleth and Estimaner Court of Petty Sessions USE Great Britain | Court of Petty Sessions (Montgomeryshire and Merioneth). | Machynlleth and Estimaner (abolished 1971 | Powys (Wales); Gwynedd (Wales) | court)
Machynlleth Citizens Advice Bureau USE Machynlleth and District Citizens Advice Bureau (active [1983]-[2005] | Machynlleth (Wales) | public advisory service)
Machynlleth National School (19th cent. | Machynlleth (Wales) | education | charity school)
Machynlleth Poor Law Union (1839-1930 | Machynlleth (Wales) | welfare administration)
Machynlleth Rural District Council USE Machynlleth (Wales) | Rural District Council (1895-1974 | Machynlleth (Wales) | local government)
Machynlleth Urban District Council USE Machynlleth (Wales) | Urban District Council (1895-1974 | Machynlleth (Wales) | local government)
Mackintosh Estate (Wales) (Glamorgan (Wales) | family estate)
MacQuillan & Company, Ebbw Vale (active 1877-1987 | Ebbw Vale (Wales) | solicitors | company)
MacQuillan and Company, Ebbw Vale USE MacQuillan & Company, Ebbw Vale (active 1877-1987 | Ebbw Vale (Wales) | solicitors | company)
Made in Wales Stage Company (1981- | Cardiff (Wales) | theatre company)
Madoc Memorial Hospital (opened [c.1920] | Porthmadog (Wales) | healthcare)
Madryn Castle Farm School (founded 1913; closed 1952 | Pwllheli (Wales) | education)
Madryn Estate (Wales) (Caernarfonshire (Wales))
Maelor (Wales) | Rural District Council (1894-1974 | Maelor (Wales) | local government)
Maelor and District Co-operative Society USE Maelor & District Co-operative Society Ltd (active 1916-1939 | Maelor (Wales) | business co-operation | company)
Maelor Rural District Council USE Maelor (Wales) | Rural District Council (1894-1974 | Maelor (Wales) | local government)
Maelor Saesneg Manor (Wales) (Wrexham (Wales) | manor)
Maen Homan Manor (Wales) USE Nant Conway Manor (Wales) ()
Maenan (Church: Penmaenmawr, Wales) (1901-1969 | Penmaenmawr | Calvinistic Methodist church)
Maenan Abbey (Conwy, Wales) (Maenan; Llanrwst | Cistercian monastery)
Maenan Abbey Estate (Wales) (Gwynedd (Wales) | family estate)
Maenan Board School (Caernarfonshire) USE Maenan Council School (active 1875-1987 | Maenan (Wales) | education)
Maenan Council School (active 1875-1987 | Maenan (Wales) | education)
Maenan Estate (Wales) (Anglesey | Family estate)
Maenclochog Board School (Active , 1852-1973 | Maenclochog (Pembrokeshire, Wales) | school)
Maengwyn Estate (Anglesey, Wales) (Anglesey | Family estate)
Maenol Estate (Wales) (Llanidloes (Wales) | family estate)
Maentwrog Isaf Chapel (Maentwrog, Wales) USE Capel Maentwrog Isaf (Maentwrog, Wales) ()
Maerdy Lodge | Defence Committee (Maerdy (Rhondda Cynon Taff, Wales))
Maerdy Lodge | Distress Committee (Maerdy (Rhondda Cynon Taff, Wales))
Maerdy Workmen's Hall and Institute (Maerdy (Rhondda Cynon Taff, Wales))
Maes Awyr Caerdydd USE Cardiff-Wales Airport (Cardiff (Wales) | airport)
Maes Awyr Caerdydd USE Cardiff-Wales Airport (Cardiff (Wales) | airport)
Maes Awyr Caerdydd-Cymru USE Cardiff-Wales Airport (Cardiff (Wales) | airport)
Maes Awyr Rhyngwladol Caerdydd USE Cardiff International Airport (Cardiff (Wales) | airport)
Maes-gwyn Estate (Wales) USE Maesgwynne Estate (Wales) (Llanboidy (Wales) | family estate)
Maes-y-gelynen Estate (Wales) (Morriston (Wales); Swansea (Wales))
Maes-yr-haf Community Centre (Trelaw, Rhondda) (Trealaw (Wales) | community centre)
Maesgamedd Estate (Wales) (active 1739-1920 | Gwyddelwern (Wales) | family estate)
Maesgeirchen Chapel (Bangor, Wales) USE Capel Maesgeirchen (Bangor, Wales) ()
Maesgwyn Estate (Wales) USE Maesgwynne Estate (Wales) (Llanboidy (Wales) | family estate)
Maesgwynne Estate (Wales) (Llanboidy (Wales) | family estate)
Maeshyfryd Cemetery (Holyhead, Wales) (Holyhead | Cemetery)
Maesmarchog School (Dyffryn Cellwen, Wales) USE Maesmarchog Primary School (Dyffryn Cellwen, Wales) (est. 1913 | Maesmarchog (Wales) | primary school)
Maesmynan Manor (Wales) (Denbighshire (Wales) | manor)
Maesnewydd Estate (Wales) (Cardiganshire (Wales) | family estate)
Maesrhuddud Home for Aged (active 1951-1967 | Blackwood (Caerphilly, Wales) | old people's home)
Maesteg (Wales) | Urban District Council. Maternity Home USE Maesteg General Hospital (active c.1914- | Maesteg (Wales) | healthcare)
Maesteg (Wales) | Urban District Council (1895-1974 | Maesteg (Wales) | local government)
Maesteg and Glyncorrwg Gas Undertaking USE Maesteg & Glyncorrwg Gas Undertaking (active 1866-1952 | Maesteg (Wales); Glyncorrwg (Wales) | gas supply)
Maesteg Control Centre | Air Raid Precautions USE Great Britain | Air Raid Precautions Dept. | Maesteg Control Centre (active 1940 | Maesteg (Wales) | civil defence)
Maesteg Distress Fund (Maesteg (Bridgend, Wales))
Maesteg General Hospital (active c.1914- | Maesteg (Wales) | healthcare)
Maesteg Local Board of Health USE Maesteg (Wales) | Local Board of Health (renamed 1879; abolished 1895 | Maesteg (Wales) | sanitation and health)
Maesteg Medical Fund (Maesteg (Bridgend, Wales))
Maesteg Miners' Welfare Fund ()
Maesteg Urban District Council (Wales) USE Maesteg (Wales) | Urban District Council (1895-1974 | Maesteg (Wales) | local government)
Maesyfed Community Council USE New Radnor (Wales) | Community Council (1974- | New Radnor (Wales) | local government)
Maesyfed Parish Council USE New Radnor (Wales) | Parish Council (1894-1974 | New Radnor (Wales) | local government)
Maesypandy Estate (Wales) (active 1848-1931 | Gwynedd (Wales) | family estate)
Maesyrhaf Congregational Church (Neath, Wales) (est. 1772 | Neath (Wales) | Independent church)
Maesyrhaf Independent Chapel (Neath, Wales) USE Maesyrhaf Congregational Church (Neath, Wales) (est. 1772 | Neath (Wales) | Independent church)
Magna Porta Manor (Wales) (Monmouthshire (Wales) | manor)
Magor (Wales) | Rural District Council (1895-1935 | Magor (Wales) | local government)
Magor and Saint Mellons Rural District Council USE Magor and St Mellons (Wales) | Rural District Council (1935-1974 | Magor and St Mellons (Wales); Monmouthshire (Wales) | local government)
Magor and St Mellons Rural District Council USE Magor and St Mellons (Wales) | Rural District Council (1935-1974 | Magor and St Mellons (Wales); Monmouthshire (Wales) | local government)
Magor Manor (Wales) (Magor (Wales) | manor)
Magor Rural District Council USE Magor (Wales) | Rural District Council (1895-1935 | Magor (Wales) | local government)
Main Colliery Company (1889-1934 | Neath; Glamorgan | Coal mining)
Maitland Trust (active [9th century]-[20th century] | Pembrokeshire (Wales) | trust | trust)
Maldwyn Woodlands Ltd (active [1951]-[1962] | Montgomeryshire (Wales) | agricultural society)
Malltraeth Manor (Wales) (active [14th century]-[20th century] | Anglesey (Wales) | manor)
Malltraeth Marsh Commissioners (Functions transferred 1953 | Malltraeth | Land drainage)
Mallwyd (Wales) | Urban District Council (1894-1974 | Mallwyd (Wales) | local government)
Mallwyd Estate (Wales) (Mallwyd (Wales) | family estate)
Mallwyd Urban District Council (Wales) USE Mallwyd (Wales) | Urban District Council (1894-1974 | Mallwyd (Wales) | local government)
Malpas and Mendalgief Manor (Wales) USE Malpas and Mendelgyf Manor (Wales) (active 1527-1935 | Malpas (Wales) | manor)
Malpas and Mendelgyf Manor (Wales) (active 1527-1935 | Malpas (Wales) | manor)
Malpas and Mendlegief Manor (Wales) USE Malpas and Mendelgyf Manor (Wales) (active 1527-1935 | Malpas (Wales) | manor)
Malpas Estate (Monmouthshire, Wales) (active 1835-1917 | Monmouthshire (Wales) | family estate)
Manafon School (1883-1995 | Manafon (Wales) | education)
Manchester & Milford Railway (1860-1911 | Mid Wales | Railway operation | Company)
Manchester and Milford Railway USE Manchester & Milford Railway (1860-1911 | Mid Wales | Railway operation | Company)
Manchester University USE University of Manchester (founded 1851; chartered 1880 | Manchester (England) | education)
Manchester, Sheffield & Lincolnshire Railway USE Manchester, Sheffield and Lincolnshire Railway Company (1847-1897 | Northern and Central England | Railway operation | Company)
Mandinam Estate (Wales) (Mandinam (Wales) | family estate)
Manley Road Girls' Home (active 1905-1934 | Wrexham (Wales) | sheltered accommodation)
Manoravon Estate (Wales) (Carmarthenshire (Wales) | family estate)
Manorbier Estate (Wales) (Manorbier (Wales) | family estate)
Manorbier National School USE Manorbier V.C. Primary School (1873- | Manorbier (Wales) | school)
Manorbier Parochial School USE Manorbier V.C. Primary School (1873- | Manorbier (Wales) | school)
Manorbier V.C. Primary School (1873- | Manorbier (Wales) | school)
Manorbier Voluntary School USE Manorbier V.C. Primary School (1873- | Manorbier (Wales) | school)
Manordeifi Upper Voluntary Controlled Primary School (Manordeifi (Wales) | school)
Manordeifi Voluntary School (1835- | Manordeifi (Wales) | school)
Manorowen Estate (Wales) (Pembrokeshire (Wales) | family estate)
Manorowen V.P. School USE Manorowen, Llanstinan and Jordanston Voluntary School (1874-2004 | Manorowen (Wales) | school)
Manorowen, Llanstinan and Jordanston National School USE Manorowen, Llanstinan and Jordanston Voluntary School (1874-2004 | Manorowen (Wales) | school)
Manorowen, Llanstinan and Jordanston Voluntary School (1874-2004 | Manorowen (Wales) | school)
Manselton (Wales) (Manselton (Wales))
Manselton ecclesiastical parish, Church of England, Diocese of St David's USE Church of England | Diocese of St David's. St John-juxta-Swansea ecclesiastical parish (abolished 1923 | Swansea (Wales) | ecclesiastical parish)
Manselton Primary School (Swansea, Wales) (opened 1902 | Manselton (Wales) | primary school)
Manselton School (Swansea, Wales) USE Manselton Primary School (Swansea, Wales) (opened 1902 | Manselton (Wales) | primary school)
Mapperley Colliery (Leicestershire (England) | colliery)
March (Earldom) USE March (England and Wales : Earldom) (first creation 1328; second creation 1479; third creation 1619; fourth creation 1679 | England; Wales)
Marchwiel (Wales) | Community Council (created 1974 | Marchwiel (Wales) | local government)
Marchwiel (Wales) | Parish Council (1894-1974 | Marchwiel (Wales) | local government)
Marchwiel Church (Marchwiel, Wales) (active 1629-1923 | Marchwiel (Wales) | church)
Marchwiel Community Council USE Marchwiel (Wales) | Community Council (created 1974 | Marchwiel (Wales) | local government)
Marchwiel Parish Council USE Marchwiel (Wales) | Parish Council (1894-1974 | Marchwiel (Wales) | local government)
Marcroes Manor (Wales) USE Marcross Manor (Wales) (active 1738-1935 | Marcross (Wales) | manor)
Marcross (Wales) (Marcross (Wales) | parish administration)
Marcross Manor (Wales) (active 1738-1935 | Marcross (Wales) | manor)
Mardy Colliery (Rhondda (Wales) | coal mining)
Margam (Wales) | Urban District Council (1894-1921 | Margam (Wales) | local government)
Margam (Wales) (Margam (Wales) | local government)
Margam Abbey Estate (Wales) USE Margam Estate (Wales) (Margam (Wales) | family estate)
Margam Abbey (1147-1536 | Margam (Wales) | monastic house)
Margam Colliery (Margam (Wales) | colliery)
Margam Copper Works School (1830-1902 | Taibach (Wales); Port Talbot (Wales) | School)
Margam Estate (Wales) (Margam (Wales) | family estate)
Margam Tin Works Elementary School (closed 1899 | Margam (Wales) | school)
Margam Tin Works School USE Margam Tin Works Elementary School (closed 1899 | Margam (Wales) | school)
Margam Tinworks School USE Margam Tin Works Elementary School (closed 1899 | Margam (Wales) | school)
Margam Urban District Council USE Margam (Wales) | Urban District Council (1894-1921 | Margam (Wales) | local government)
Marian (Trust) (Given in 1811 | Dolgellau | Recreation | Trust since 1811)
Marine Colliery (Ebbw Vale (Wales) | coal mining)
Marine Yard (Holyhead, Wales) (active 1957-1977 | Holyhead (Wales) | boat and ship repairs)
Maritime and Coastguard Agency (Great Britain) (created 1998 | Great Britain | maritime safety)
Markham and District Welfare Association (Markham (Wales); Caerphilly (Wales))
Markham Colliery (Active , 1932-1956 | Blackwood (Wales))
Marloes and St Brides National School USE Marloes and St Brides Voluntary School (Active , 1872-1974 | Marloes (Wales); St Brides (Pembrokeshire, Wales) | school)
Marquess of Abergavenny estate (active [16th century]-1950 | England; Wales | family estate)
Marsh Farms Limited (Sealand, Wales) USE Marsh Farms Ltd (Formed 1927; active until [1948] | Sealand (Wales); Hawarden (Wales) | farming | company)
Marsh junior and Hayward, | solicitors (Llanidloes (Wales) | solicitors)
Marsh, J., & Sons (active 1904-1930 | Abergavenny (Wales) | coal merchants | company)
Marshfield Iron and Tin Works ()
Martletwy National School USE Martletwy Voluntary School (1852-1952 | Martletwy (Wales) | school)
Martletwy Voluntary School (1852-1952 | Martletwy (Wales) | school)
Marxian Working Men's Club and Institute (Blaen Clydach (Wales))
Mary Hannah (Ship) (Amlwch | Ship)
Mary of Caernarfon (Ship) (Schooner)
Mary Stewart (Schooner) (active 1841)
Mary Wilcox Charity (Cowbridge (Wales) | charity | charity)
Mathafarn Estate (Wales) (Mathafarn (Montgomeryshire, Wales) | family estate)
Mathern (Wales). | School Board |1 USE Mathern School Board (Active 1875-1898 | Mathern (Wales) | educational administration)
Mathern Primary School (closed 1988 | Mathern (Wales) | education)
Mathern School Board (Active 1875-1898 | Mathern (Wales) | educational administration)
Mawddach and Union Internal Drainage Board (1930-1948 | Mawddach Valley; Gwynedd | Drainage)
Mawr (Wales) | Community Council (created 1974 | Mawr (Wales) | local government)
Mawr (Wales) | Parish Council (1894-1974 | Mawr (Wales) | local government)
Mawr Community Council USE Mawr (Wales) | Community Council (created 1974 | Mawr (Wales) | local government)
Mawr Parish Council USE Mawr (Wales) | Parish Council (1894-1974 | Mawr (Wales) | local government)
Mayals Primary School (Swansea, Wales) (active 1954-2002 | Mayals (Wales) | school)
Maybery, Williams and Cobb (active [19th century] | Brecon (Wales) | Solicitors)
Maylors Manor (Wales) USE Maelor Saesneg Manor (Wales) (Wrexham (Wales) | manor)
MCA USE Maritime and Coastguard Agency (Great Britain) (created 1998 | Great Britain | maritime safety)
McClelland, Welshpool USE R. McClelland, Welshpool (active [1920s] | Welshpool (Wales) | tractor salesman)
McGeogh, George and Gillam ([active 1880-1958] | Haverfordwest (Wales) | medical practice)
McLaren & Jeens (Firm) USE McLaren, Jeens and Seacome, Solicitors (active [1928]-[1960] | Cheltenham (England) | solicitors)
McLaren, Jeens and Seacomb (Firm) USE McLaren, Jeens and Seacome, Solicitors (active [1928]-[1960] | Cheltenham (England) | solicitors)
McLaren, Jeens and Seacome, Solicitors (active [1928]-[1960] | Cheltenham (England) | solicitors)
MCPS (Society) (established 1924 | Great Britain | copyright protection)
Mebyon Kernow. | Cowethas Flamank USE Cowethas Flamank ()
Mechanical-Copyright Protection Society USE MCPS (Society) (established 1924 | Great Britain | copyright protection)
Medical Aid to Russia Committee (Nantymoel, Wales) (Nantymoel (Wales))
Medical Officer of Health for Merionethshire USE Merioneth (Wales) | County Council. | Medical Officer of Health (active 1921-1947 | Gwynedd (Wales) | health administration)
Medical School of St. George's Hospital USE St. George's Hospital (London, England). | Medical School (est. 1834 | London (England) | medical school)
Medland and Henry Taylor (Manchester | Architects)
Meidrim (Wales) | Community Council (created 1974 | Meidrim (Wales) | local government)
Meidrim (Wales) | Parish Council (1894-1974 | Meidrim (Wales) | local government)
Meidrim Community Council USE Meidrim (Wales) | Community Council (created 1974 | Meidrim (Wales) | local government)
Meidrim Parish Council USE Meidrim (Wales) | Parish Council (1894-1974 | Meidrim (Wales) | local government)
Meifod Manor (Denbighshire, Wales) (Meifod (Denbighshire, Wales) | manor)
Meillionydd Estate (Wales) (Llanfaelrhys; Llŷn | Family estate)
Melai Estate (Gwynedd, Wales) USE Maenan Abbey Estate (Wales) (Gwynedd (Wales) | family estate)
Melai Estate (Wales) (active [18th century] | Gwynedd (Wales) | family estate)
Meliden (Wales) | Parish Council (1894-1974 | Meidrim (Wales) | local government)
Meliden ecclesiastcial parish USE Meliden (Wales) ()
Meliden Parish Council USE Meliden (Wales) | Parish Council (1894-1974 | Meidrim (Wales) | local government)
Melin Esgob (Watermill) (Llandyfrydog | Watermill)
Melin Griffith Tin Works USE Melingriffith Iron and Tinplate Works (active 1768-1799 | Whitchurch (Wales) | iron and tinplate works)
Melin Newydd (Mill: Llanfachreth, Wales) (Llanfachreth; Rhyd-y-main; Brithdir | Corn mill)
Melin School USE Melin Junior School (Neath, Wales) (opened 1873; re-opened 1899, 1985 | Melincryddan (Wales); Neath (Wales) | Board school)
Melincourt Independent Chapel (Resolven, Wales) (1799-1875 | Resolven (Wales) | Independent Church)
Melincryddan Estate USE Cryddan Park Estate (Wales) (Neath (Wales) | family estate)
Melincryddan School USE Melin Junior School (Neath, Wales) (opened 1873; re-opened 1899, 1985 | Melincryddan (Wales); Neath (Wales) | Board school)
Melingriffith Tin Works USE Melingriffith Iron and Tinplate Works (active 1768-1799 | Whitchurch (Wales) | iron and tinplate works)
Melingruffudd Tin Works USE Melingriffith Iron and Tinplate Works (active 1768-1799 | Whitchurch (Wales) | iron and tinplate works)
Mellington Hall Estate (Wales) (Montgomeryshire (Wales); Shropshire (England) | family estate)
Memorial Baptist Church (Swansea, Wales) (est. 1873 | Swansea (Wales) | Baptist church)
Memorial Chapel (Porthmadog, Wales) USE Porthmadog Memorial Chapel (Porthmadog, Wales) ([active 1877-1885] | Porthmadog (Wales) | church)
Memorial Hall Presbyterian Church (Cardiff, Wales) (Cardiff (Wales) | Presbyterian Church)
Menai Bridge (Wales) | Local Board (Abolished c. 1894 | Menai Bridge | Local government)
Menai Bridge (Wales) | Urban District Council (1894-1974 | Menai Bridge | Local government)
Menai Bridge Brass Band (Founded 1890s | Menai Bridge | Brass band)
Menai Manor (Wales) (active [13th century]-[19th century] | Anglesey (Wales) | manor)
Menai Suspension Bridge (Wales) (Completed 1826 | Menai Bridge; Bangor | Suspension bridge)
Merched y Wawr | Anglesey area (Anglesey | Women's society)
Merched y Wawr | Cangen y Bontfaen (active 1993- | Cowbridge (Wales) | women's society)
Merched y Wawr | Cowbridge branch USE Merched y Wawr | Cangen y Bontfaen (active 1993- | Cowbridge (Wales) | women's society)
Merched y Wawr | Ffynnon Groes branch USE Merched y Wawr | Cangen Ffynnon Groes (active [1968]-[1997] | Pembrokeshire (Wales) | women's society)
Merched y Wawr | Rhanbarth y De Ddwyrain (active 1993- | Wales | women's society)
Merched y Wawr | Sir Benfro ([1967]-[c. 1974] | Pembrokeshire (Wales) | women's society)
Merched y Wawr | South East Wales Region USE Merched y Wawr | Rhanbarth y De Ddwyrain (active 1993- | Wales | women's society)
Merched y Wawr. | Caernarfonshire USE Merched y Wawr | Rhanbarth Arfon (active 1968-1990 | Gwynedd (Wales); Caernarfonshire (Wales) | women's society)
Merioneth Agricultural Society (Merionethshire | Agricultural society)
Merioneth (Wales). | Constabulary |1 USE Merioneth Constabulary (Police: Wales) (1858-1967 | Merioneth (Wales); Gwynedd (Wales) | policing)
Merioneth (Wales). | Court of Petty Sessions (Estimaner) |1 USE Great Britain | Court of Petty Sessions (Montgomeryshire and Merioneth). | Machynlleth and Estimaner (abolished 1971 | Powys (Wales); Gwynedd (Wales) | court)
Merioneth (Wales). | Court of Quarter Sessions of the Peace. | Licensing Committee and Compensation Authority |1 USE Great Britain | Court of Quarter Sessions of the Peace (Merioneth). | Licensing Committee and Compensation Authority (abolished 1971 | Gwynedd (Wales) | court)
Merioneth (Wales). | Court of Quarter Sessions |1 USE Great Britain | Court of Quarter Sessions of the Peace (Merioneth) (1536-1971 | Gwynedd (Wales) | court)
Merioneth (Wales). | Rural Community Council |1 USE Merionethshire Rural Community Council (active 1947-ca. 1969 | Gwynedd (Wales); Denbighshire (Wales) | local government)
Merioneth Association of Independent Friendly Societies (Merionethshire | Friendly society)
Merioneth Constabulary (Police: Wales) (1858-1967 | Merioneth (Wales); Gwynedd (Wales) | policing)
Merioneth County Gaol (Wales) (1813-1878 | Dolgellau | Gaol)
Merioneth County Nursing Association (Merionethshire | Healthcare support)
Merioneth Girl Guides Association USE Girl Guides Association | Merioneth Branch (active 1920-1970 | Gwynedd (Wales); Denbighshire (Wales))
Merioneth Home Guard (1940-1945 | Merionethshire | Civil defence)
Merioneth Liberal Association (active 1898-1955 | Gwynedd (Wales) | political party)
Merioneth Local Medical and Panel Committee (active 1928-1934 | Gwynedd (Wales) | healthcare)
Merioneth Local Medical Committee (1934-1974 | Gwynedd (Wales) | healthcare administration)
Merioneth Voluntary Orthopaedic Association (active 1929-1943 | Gwynedd (Wales) | healthcare)
Merionethshire (Wales) | County Council |1 USE Merioneth (Wales) | County Council (1888-1974 | Dolgellau (Wales); Merioneth (Wales) | local government)
Merionethshire Air Raid Precautions USE Great Britain | Air Raid Precautions Dept. | Merioneth (active 1938-1939 | Gwynedd (Wales) | civil defence)
Merionethshire Constabulary USE Merioneth Constabulary (Police: Wales) (1858-1967 | Merioneth (Wales); Gwynedd (Wales) | policing)
Merionethshire Court of Petty Sessions (Estimaner) USE Great Britain | Court of Petty Sessions (Montgomeryshire and Merioneth). | Machynlleth and Estimaner (abolished 1971 | Powys (Wales); Gwynedd (Wales) | court)
Merionethshire Medical Officer of Health USE Merioneth (Wales) | County Council. | Medical Officer of Health (active 1921-1947 | Gwynedd (Wales) | health administration)
Merionethshire Quarter Sessions USE Great Britain | Court of Quarter Sessions of the Peace (Merioneth) (1536-1971 | Gwynedd (Wales) | court)
Merionethshire Railway (Gwynedd (Wales); Denbighshire (Wales) | railway company)
Merionethshire Rivers Catchement Board USE Merioneth (Wales) | Rivers Catchment Board (active 1938-1951 | Gwynedd (Wales) | drainage and water management)
Merthyr Borough Court of Petty Sessions USE Great Britain | Court of Petty Sessions (Glamorgan). | Merthyr Borough Division (Merthyr Tydfil (Wales) | Judicial)
Merthyr Borough Petty Sessions USE Great Britain | Court of Petty Sessions (Glamorgan). | Merthyr Borough Division (Merthyr Tydfil (Wales) | Judicial)
Merthyr Dyfan (Wales) (Merthyr Dyfan (Wales) | local government)
Merthyr Llantwit Colliery Limited (Neath Port Talbot (Wales))
Merthyr Mawr (Wales) (Merthyr Mawr (Wales) | local government)
Merthyr Mawr church USE St Teilo's Church (Merthyr Mawr, Wales) (active 1695-1837 | Merthyr Mawr (Wales) | church)
Merthyr Miners' Hall (Merthyr Tydfil (Wales))
Merthyr Tudful (Wales) | Cyngor Bwrdeistref Sirol|1 USE Merthyr Tydfil (Wales) | County Borough Council ()
Merthyr Tydfil (Wales : Borough) (active 1852-1973 | Merthyr Tydfil (Wales) | local government)
Merthyr Tydfil (Wales) | Borough Council ()
Merthyr Tydfil (Wales) | County Borough Council ()
Merthyr Tydfil (Wales) | Parish Council (created 1894 | Merthyr Tydfil (Wales) | local government)
Merthyr Tydfil (Wales). Poor Law Union |1 USE Merthyr Tydfil Poor Law Union (1836-1930 | Merthyr Tydfil (Wales) | welfare administration)
Merthyr Tydfil (Wales). School Board |1 USE Merthyr Tydfil School Board (Merthyr Tydfil (Wales) | local education administration)
Merthyr Tydfil (Wales) (Merthyr Tydfil (Wales) | parish administration)
Merthyr Tydfil Borough USE Merthyr Tydfil (Wales : Borough) (active 1852-1973 | Merthyr Tydfil (Wales) | local government)
Merthyr Tydfil Borough Council USE Merthyr Tydfil (Wales) | Borough Council ()
Merthyr Tydfil Borough Police Force (1908-1969 | Merthyr Tydfil (Wales) | policing)
Merthyr Tydfil Coroner USE Mid Glamorgan (Wales) | East District. | Coroner (Merthyr Tydfil (Wales) | investigation of the circumstances of unnatural, sudden, or suspicious deaths, and deaths in prison)
Merthyr Tydfil Gas Undertaking (1836-1949 | Merthyr Tydfil (Wales) | gas supply)
Merthyr Tydfil Local Board of Health USE Merthyr Tydfil (Wales) | Local Board of Health (1850-1895 | Merthyr Tydfil (Wales) | sanitation and health)
Merthyr Tydfil Parish Council USE Merthyr Tydfil (Wales) | Parish Council (created 1894 | Merthyr Tydfil (Wales) | local government)
Merthyr Tydfil Poor Law Union (1836-1930 | Merthyr Tydfil (Wales) | welfare administration)
Merthyr Tydfil School Board (Merthyr Tydfil (Wales) | local education administration)
Merthyr Tydfil Urban District Council USE Merthyr Tydfil (Wales) | Urban District Council (1894-1974 | Merthyr Tydfil (Wales) | local government)
Merthyr Tydfil Wesleyan Circuit (Merthyr Tydfil (Wales) | church administration)
Merthyr Vale Women's Support Group ()
Merthyr Wesley Chapel (Merthyr Tydfil, Wales) (Merthyr Tydfil (Wales) | Wesleyan Methodist church)
Merthyr, Tredegar and Abergavenny Railway USE Merthyr, Tredegar & Abergavenny Railway (Established 1857; began operating 1862; closed 1958. | Blaenau Gwent (Wales); Tredegar (Wales); Abergavenny (Wales); Merthyr Tydfil (Wales); Monmouthshire | Railway construction and operation)
Mesopotamia Expeditionary Force, 1915-1919. (1915-1919 | Mesopotamia | Expeditionary force)
Messrs A.J. Jacobs and Sons USE A.J. Jacobs and Sons (Active 1914-[1950s] | Newport (Wales) | pawnbrokers)
Messrs Bennett and Sayer of Derby USE Bennett & Sayer Ltd ([active 1900-1999] | Derby (England) | engineers)
Messrs Briscoe and Dickson (Declared bankrupt 1816. | Dublin | Woollen-drapers)
Messrs Coppack and Vickers (1875-1883 | Connah's Quay (Wales) | ship broker)
Messrs D. Glasbrook and Company | Morriston Tinplate Works (Morriston (Wales))
Messrs D. Glasbrook Company | Midland Tinplate Works ()
Messrs D.T.M. Jones and Co. USE D.T.M. Jones (Firm) (founded ca. 1775 | Llandovery (Wales) | solicitors)
Messrs David and David USE David and David (Firm) (active 1846-1933 | Cardiff (Wales) | land agents, surveyors)
Messrs Davies and Anwyl (Bala | Solicitors)
Messrs Duff, Herbert and Mitchell, Ltd USE Duff, Herbert and Mitchell (active [1944]-[1954] | Felinheli (Wales) | steamship maintenance | company)
Messrs Dunphy & Sons (Penmaenmawr | Grocers)
Messrs Gerald Davies & Oakes USE Gerald Davies & Oakes (active 1975-1983 | Holywell (Wales) | solicitors)
Messrs J. S. Laurie and Company USE J.S. Laurie and Co. (Beaumaris (Wales) | solicitors)
Messrs Jennings and Williams USE Jennings and Williams (Llanelli (Wales) | solicitors)
Messrs John Pritchard & Company (Bangor (Wales) | Company)
Messrs Jones and Morris (Porthmadog | Sailmaking; suppliers of ship accessories)
Messrs Lee, Bygott and Eccelston, | solicitors USE Lee, Bygott and Eccelston, | solicitors ([active 1920] | Whitchurch (Shropshire, England) | solicitors)
Messrs Longmore USE Longmore, | solicitors (active 1915 | Hertford (England) | solicitors)
Messrs McLaren, Jeens & Seacome (Firm) USE McLaren, Jeens and Seacome, Solicitors (active [1928]-[1960] | Cheltenham (England) | solicitors)
Messrs Nettlefolds Ltd USE Nettlefolds Ltd (active 1896-1909 | Rogerstone (Wales) | ironworks)
Messrs Nevill, Everitt and Company (company)
Messrs Parry & Sons, Penygroes (Gwynedd, Wales) USE Parry & Sons, Penygroes (Gwynedd, Wales) (Penygroes (Gwynedd, Wales) | printers)
Messrs Parry and Sons, Minerva Printing Works USE Minerva Printing Works, Penygroes (Gwynedd, Wales) (active 1906-1971 | Penygroes (Llanllyfni, Gwynedd, Wales) | printing)
Messrs Poole, solicitors, Caernarfon USE Poole, solicitors ()
Messrs R. K. Lucas & Son (Haverfordwest (Wales) | estate agents)
Messrs R. K. Lucas and Son USE Messrs R. K. Lucas & Son (Haverfordwest (Wales) | estate agents)
Messrs R. T. P. Williams USE R. T. P. Williams and Sons, solicitors (Haverfordwest (Wales); Milford Haven (Wales) | solicitors)
Messrs Reynolds, Getley & Co. USE Reynolds, Getley & Co. | Quaker ironworkers (active 1760-[1800] | Cardiff (Wales); Bristol (England) | ironmaking; tinplate | company)
Messrs S.R. Dew and Prothero USE S.R. Dew and Prothero (Firm) (active 1960s | Holyhead (Wales); Valley (Wales) | solicitors)
Messrs W. C. A. Williams and Tweedy USE Williams and Tweedy | (Firm) (active [1910]-[1926] | Monmouth (Wales) | solicitors)
Messrs Watkins and David (Newtown (Wales) | Solicitors)
Messrs William Gilbertson & Company USE W. Gilbertson and Company (Pontardawe (Wales) | tinplate industry | company)
Messrs Williams and Roberts USE Williams & Roberts, medical practitioners (active [19th century] | Llanystumdwy (Wales) | healthcare)
Messrs Williams and Tweedy USE Williams and Tweedy | (Firm) (active [1910]-[1926] | Monmouth (Wales) | solicitors)
Messrs Wm Evans & Co. Ltd USE William Evans & Co. Ltd (established 1879; active 1879-1978 | Newport (Wales) | grocers | company)
Messrs. John Harvey & Sons USE John Harvey & Sons (Haverfordwest, Wales | land agents)
Metal Alloys (South Wales) Ltd (active 1939-1970 | Treforest (Wales) | metalworking | company)
Metal Street Mission Church (Cardiff, Wales) (Established 1926. | Cardiff | Church)
Methodist Book Room (Bangor, Wales) USE Llyfrfa Wesleyaidd (Bangor, Wales) (Bangor (Wales) | Publishing)
Methodist chapel | Sirhowy (Tredegar, Wales) USE Sirhowy Methodist Chapel ([active 1955-1999] | Tredegar (Wales) | Methodist chapel)
Methodist Church (Great Britain) | Barry Circuit (est. 1955 | Barry (Wales) | church administration)
Methodist Church (Great Britain) | Cylchdaith Caernarfon (1932-1974 | Caernarfon (Wales))
Methodist Church (Great Britain) | Cynon Valley Circuit (Aberdare (Wales) | church administration)
Methodist Church (Great Britain) | Lancashire Welsh Mission (1932-193
